Astrophysics (index)

Number Density

(number of objects per volume)

Number Density is a term for the number of objects per unit volume.

n = —

for Number Density n, number of objects, N and volume V. The term is often used for atoms or molecules, e.g., in a gas, in contrast to other measures such as Mass Density.

Number Density can also be used for larger objects, e.g., stars.


Referenced by:
Absorption Coefficient
Boltzmann Equation
Column Density
Luminosity Function (LF)
Saha Equation